import { NextAuthOptions } from "next-auth";
import CredentialsProvider from "next-auth/providers/credentials";
import { z } from "zod";

const loginSchema = z.object({
  username: z.string().min(1, "用户名不能为空"),
  password: z.string().min(1, "密码不能为空"),
});

export const authOptions: NextAuthOptions = {
  providers: [
    CredentialsProvider({
      name: "credentials",
      credentials: {
        username: { label: "用户名", type: "text" },
        password: { label: "密码", type: "password" },
      },
      async authorize(credentials) {
        if (!credentials) return null;

        try {
          const validatedFields = loginSchema.safeParse(credentials);
          
          if (!validatedFields.success) {
            return null;
          }

          const { username, password } = validatedFields.data;

          // 调用后端API进行认证
          const response = await fetch(`${process.env.NEXT_PUBLIC_API_URL}/auth/login`, {
            method: "POST",
            headers: {
              "Content-Type": "application/json",
            },
            body: JSON.stringify({ username, password }),
          });

          if (!response.ok) {
            return null;
          }

          const user = await response.json();
          
          return {
            id: user.id.toString(),
            username: user.username,
            email: user.email,
            name: user.full_name || user.username,
          };
        } catch (error) {
          console.error("认证错误:", error);
          return null;
        }
      },
    }),
  ],
  callbacks: {
    async jwt({ token, user }) {
      if (user) {
        token.id = user.id;
        token.username = (user as any).username;
        token.email = user.email;
      }
      return token;
    },
    async session({ session, token }) {
      if (token && session.user) {
        (session.user as any).id = token.id as string;
        (session.user as any).username = token.username as string;
        (session.user as any).email = token.email as string;
      }
      return session;
    },
  },
  pages: {
    signIn: "/login",
    error: "/login",
  },
  session: {
    strategy: "jwt",
  },
  secret: process.env.NEXTAUTH_SECRET,
};